VIRGINIA--The gunman who killed two Virginia television journalists on air carried out a well-planned assault and identified with mass murderers and the Sept. 11, 2001, attacks on the United States, authorities said on Friday.

The shooter, Vester Flanagan, gave no sign of his destination or next move when he fled after gunning down the journalists from Roanoke station WDBJ7 on Wednesday, the Franklin County Sheriff's Office said in a statement. "It is evident that Wednesday morning's attack was well-planned and premeditated" and Flanagan apparently acted alone, the statement on the shooting investigation said.

Flanagan, a former station employee, fired 17 rounds from a .40 caliber Glock pistol when he attacked reporter Alison Parker and cameraman Adam Ward as they were conducting a live interview at Smith Mountain Lake in southwest Virginia, the statement said.

Flanagan shot himself during a police chase in northern Virginia and died. The woman who was being interviewed was wounded and hospitalized.

Evidence and his writings show that Flanagan "closely identified with individuals who have committed domestic acts of violence and mass murder, as well as the Sept. 11, 2001, attacks on the U.S.," said the statement. Almost 3,000 people were killed in the 9/11 attacks.

The statement said two Glock pistols were recovered from Flanagan's rental car. No other firearms have been found.

The on-air killings have brought renewed calls for gun control in the United States and in Virginia, where the National Rifle Association gun lobby is headquartered. Virginia Governor Terry McAuliffe, a Democrat, vowed to press ahead with legislation on background checks for gun buyers, although the Republican-led legislature has rejected his gun control efforts.

Citing a federal law enforcement source, USA Today said Flanagan had legally bought the handguns. He passed a background check despite his apparent emotional problems, it reported.